Natasha places an online order for plate holders to display her antique plates. she chooses a specific site because it has a promotional offer of 15% off on all purchases. she orders 3 large holders for $4.95 each, 2 medium holders for 3.25 each and 2 small holders for $1.75 each. there is no sales tax on her purchase, but she must pay a flat rate of $5.35 for shipping and handling. what is the total of natasha? s online purchase? a. $19.64 b. $24.18 c. $26.47 d. $28.45

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

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step-by-step explanation: